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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '856b995e796e83c1a5f6bfbf05f4d3e38fd4c32cda094a4b1aed446fbc8bb18b' 
  AND token = 'yUjtNZD1EMHa5PDGY/uasz1P7m8mgCrBPCtcIZxxSpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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