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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '879a881d6710a8978d80ab5d5bf1b50ddb138488a3b0b08f90e6174931494641' 
  AND token = 'iIsG2v27WU6kP7Fa4rVa1K4nrSnmsbF+amPO/gNI8l8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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