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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa790fc2ec847e553f56895c225e2543ad17eae674e1b7f21a64b93ad7d54913' 
  AND token = 'ok+m3+GGXkxJr9HgpSoZN1XY61vKDdGGDg58i1MH+RI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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