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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98fa1ad426ea207180dd88260fc48697f0294e8e28f8b5042b866692c5f9e918' 
  AND token = 'MxJ0JmCSIHieIm8+i0gSUhZwmtJy+KgYorvDntHxE10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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