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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fb4330f3484ebf2bb55bb0ca13da1d43181a40077ab1192adbfd6896021025f' 
  AND token = 'uvH30e7rK/nsxkAA2xnpKbo4TviqK9ofHiJ7Nu2KuWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00098

JSON explain

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