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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37d134c9ac128a8cfddf84e8932900de94404661d558bc7fa723eafc8e52cf57' 
  AND token = '2f9zbAecQ9KNAstSzV0i5Ph5URbuYN9+OmF84LNNByM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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