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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9ab0acff4a7c05c3523aa3a3c8df6cb358625da4a181e760e9f575846aa7b11' 
  AND token = 'sjXoE2Os4bE4m/0fqQLeHquTnobaSbNOFGFXrRK1MXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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