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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '899950e27f32406ad721961126e873b770e760791c9e5e6f5f8d767656de7c4a' 
  AND token = 'E2p7pLDz223LDn+sRqYEptRJtqQ7nEiXRElnRyg2pWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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