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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9f5087b4c02d2f968c809219dbb3dafd0f044048a82bfe013effd4b359031b2' 
  AND token = 'Aw1Lnmd9hZ3VrDznqT282pP5XJ+5ANNHGf3sAeoPhjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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