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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b32e4916391617c1ca7dec4c7bc71870950cb46c3e698eb984556eb2efb184b' 
  AND token = 'qnAfWBjFLC9sFzDPt+62DrqJ3J6DxuOpwB10d3eBtDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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