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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06bd8c91485de1d8601a3778985af77469e73e5ae3826382a3b406aa11dd5824' 
  AND token = 'ay0aYQqLoKQoL+ZI2E/cpR1C9LPbGeIQiHEa8/M48dE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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