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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13abac8b1ddb8e5ad6c9f37182a2251a34619dc1b0587baf5822cfed5cd46557' 
  AND token = 'MweBcBaAbdmsRiC+oMT2NsSSG7mR4du+jbTi3Pb+s5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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