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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db386937e97f7fea597c4307ef3f303acc5a1059eab82762c4d0460043e43979' 
  AND token = 'aa6K9e5XQUURZytW2XM6zmp8+/gHv3QBB1vXIkcROYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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