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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8db7c2cd359f2d0414db811ec1b899407f03fcb5ff21eb50b06cb2612d76e153' 
  AND token = 'zsj8YNpXR+x500LDjhRQnq6YeoTmfU8l7664FLyUs7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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