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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed85b5c9787b76fecb4322ca4b06ac44dda99753fc265223fe77b2c4f2d9bf4e' 
  AND token = 'o/mMN9hK8ov+jGRvN01Jxf0rkjd1VGh6dGp6O4Sl6FI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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