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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c118b3383adeafe387d68e2d50fa62116e322ac0fd8824774c4454652867664' 
  AND token = 'Ba3JNPv5H2ao4meDnzTKZ8R8EH38T7EnRNRmRFIfj/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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