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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b9874c181131f26d4a274cf31411700e0afe0540f7867e848784701d015ec39' 
  AND token = '4y6HDmRicksu0QE74QvVX6wyTKJyJWejTWyW/zp8Myc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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