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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc1b9aabe71da88af55b0084da4b3dc3b4b4c44e38194e89424348743ffcb8b0' 
  AND token = '/90Rf/Jp3SwP37W7H80+kIuUFu7KAsQEfPTFYAWMtpc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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