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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87f1256a0b500c6fa6eeb578174a8d2eba7ed58abaddd32a8a81404700932181' 
  AND token = 'maaZtpy79hrw8GZW/KcjSAReamvIjjAVR1poZZuVDPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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