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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a406a5051ff86cec21bf76c3f9080eed7e5db5a04a7d1836f2a0f21965efcb74' 
  AND token = 'OIXkG4YwW3VfvKQVBVmufeGoc2Xirk1zfDV2jYaRn7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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