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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e439d097aa7c26a9b407b4962b510b06c00fbd164e02593a64235b852c471222' 
  AND token = 'tsJ5txVZIp4Qmgons0nlCf2tBioe5LfhfXEO6Br91Fc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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