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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5cce0df58377baad8afb67216e580e83e602dd46cfcab804f12fad7956ce029' 
  AND token = 'ATZDWskY6DTs6iMSPC3J5MQXDGsSJc3MA5eyONGPyzo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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