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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa852f1170540daabc054df23fb6bb70722ecc5a8c17cd5a3cebaa2a72cd8bf9' 
  AND token = '/cyzrxrPeX3SksrthPNHI6KzForragj+3aZtfFz1rs8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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