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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a1d32d4f0e43c4f5a2c8f001afdd198d5ad3f11ac7206bb3f4074463e9af618' 
  AND token = '1/kJ1DFxiiIQ/aD7ySR3BR3Ocp2kO9ML11+gfxQqpE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}