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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b20659c2937d1851b5799af5052c58d66a0fcefd4be271e7b1ffaa6e0a1ec345' 
  AND token = 'pyBPuJW7P6/wSqE4Z6ZB56u5w/cyTea5TpK4jTTG6jA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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