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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abecccbe296bc662d07e46dd9194b541aff2176d1ef3d7f4b4d2f30dd567f108' 
  AND token = '+acF0vdsuJNDdV3B8dh+b99Vd8ClxcrBF1C3fRqEbnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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