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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76a8ee3034b68b00b3aecaeda534cc2887974a9858e271f186cd9e23b1fa70e9' 
  AND token = '5N7jV90BONwDTHjvqehkPHLldKVE69NOTQCwMj7MIR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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