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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eae7f26c57a62ed8f720424b7c97e5316f828012584dd56451df1a42168d1a8d' 
  AND token = 'AIRDyQ7f1g/hiYtKmJCM0S/fDPG/JLOHMnR9J+flI0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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