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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6cf26c918c90ec802c4d141b0a7c89ad5924bfc3cf227aa814b08608726d4bc' 
  AND token = '/3D8vdkb+Qa1IDXhuCu+ArYqikk34bPwqaFlll173ZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00119

JSON explain

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