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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0fc5558b41de3a202cd800845b8d464ecc8d149abcaa79e56d2836aa7ccf546' 
  AND token = 'ogekG3H2bmrVQK8vXOcPsDOKagFoH04tT0dnpV5VRCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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