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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a27d0b530f451a5a35541d387d10ac513e1978d7165c7bb47f699d4829aa5c9' 
  AND token = 'z4dV0auQzxpm55IkSCi+aERQkDerdOfE8D6eLBt1kWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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