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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea32aeb29edd1f9947f767cb4daa262449ff6cf4f9585a59324e892233bf1d02' 
  AND token = '+UvHhYPCM2qQLiudfp+u1eIpB8BQDZssBsR6z+y7tH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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