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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6314d68d15007fae9d7cac95623082a477937cf0ab4dfe0dd6da04aee8657e35' 
  AND token = 'i/Y+XNF9JUaAaPjK09H+yTSVipMvcFG2utmzIkIbLXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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