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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99f009324dcc6fd22bd83b77c3127ec2d7c59154695d758220c7b2ca3af84d44' 
  AND token = 'Z1CxVBSljtX/dc/qbqLoHzLan16HPKC16kayeEJWQc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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