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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e16f47c53f4cfd3eebc1d61890c339399d95f7ccdf170d33fea08a3cbbb08fa' 
  AND token = 'CyOFLfdaq8JgGDgd8Nua4vvppC0hZJV3hy3jkYLs1Po=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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