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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e14d9f4623fcdea114f4b88a7f2340483bf06b2e2e3572d11684756d776ccd7' 
  AND token = 'n1VUZJJCfPRRuFftlJd+NktDl0XMMwlcyFtEPKzVGhc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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