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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60fb9f5108a0060afa541c267727d99e732710805d6a6c5be0e1ce90efeb2f53' 
  AND token = 'bAgZKAKiM5GI7XDqAptNwORjvPZ7NpoSQuKA2upt6Uo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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