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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cdbe211d1611fa4698459fece17e6c7ae0b02346cac77878bfef764b8414d01' 
  AND token = 'dDYlSf+FYgkye30QdMHAJpGjR5589CDkb0saEr6zDaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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