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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93f4176c4bdb94eb279b7c987c3df1d84bc63529440df768c30b03a6b4b0b375' 
  AND token = 'vyNMJ+/AwDWq8cYUBP/Cp4RPUkNdJo1xftw+WcLouHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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