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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab9d9d818ecdd4c13556d3b53b1560616f975506443f263fb42b5ce53c091e6e' 
  AND token = 'r0yl82nZQTHyTEb4CLEcn/PkZyFk19Op5S1pV3UvPAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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