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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0212fd62bdc07a7c73ca440c6cb62dc03ae9e5e6221bec891876e8f00defb7a' 
  AND token = 'KCFGV35+r4vz4BGNS4zAYKUuPOTxiIn1xk07toET0+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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