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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '548480553216361fd7bb2c3e5b58ee3f647adee85c49e243d87b6dc8833937da' 
  AND token = 'GhCteXTsPSbrvXE1l8l3zi6EHxVRE1riJLIJ5eKnm4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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