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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03a1db71fd30243d2428ce8197573f69b0c5acc327993c660f684545f5fc29a4' 
  AND token = 'jBC/fUkaIKhhBfWHCwWNU03xO54+dO0VhiV3j8Bf19g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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