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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '621625506b2748587fb98bff3bc0310949fac7417a14a1c55c42329fa9260aa8' 
  AND token = 'xN8pGKt6fTzRDQAHixpYssRsy/ncaWg+x3VD71Iiz8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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