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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f92949c825da0c2d158a8fc42b59a67f5db042c65d455776914386c14ca4422' 
  AND token = 'hFy4RwF1O/afE2Uske6bLZZOyK9JEShDD95eVYBLWts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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