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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df7c01c78eaa26bcb2412ed2303b13e3004f7679aa8ab13fc9cdd3600572a34c' 
  AND token = 'jNAN8eKmqjdqx7J7l+FJbASMFfmtqcW3SOs4qGLofds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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