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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e87b9b9f856027fc499e705bd3b247a1d4eda2b8a0d9b556fbf3859efe34748' 
  AND token = '4LHq293UOGB/wC7HYPbgueO+rlGoM3ewMoDZ7qPlSnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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