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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eabe6e4bb31ea31cb714ba374b548abe4f6fe1b8f2122625e07d51b0a36c24a8' 
  AND token = '6GuVBPPblCMKiK53OA1nymoJLKscLfM/KNjIfdgtK6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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