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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32c03d39598e9e6c6fac5d6a0ec1f9b02bf193cbf76d274677f898392d09b5eb' 
  AND token = 'Eml9THT2DfmmeJVzzpNUQ7oZUVZNyRBHLJCb9aL7zzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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