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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e95815f3f5423931818b1c514a16a6ba324334bbda792a4e383c3abaa25a5b2a' 
  AND token = 'TNamk1XOEab6Ybh6oidK6gGg7LESvmKWaAigCTQl0qE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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