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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '303b42a62628727b3209e0b7eb53493fc84aa341f1d059063649bbfd4782aa9c' 
  AND token = 'frtJns6utH9M8ha85RLoqdst07iwjIeZ70tECfxBEJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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