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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3479e9edcfb44721fdbd028633461f5cf932eeed6f4366334c14f728e501ab77' 
  AND token = '0FG/piVRp1CsSq15Ek6Ugiylsi302FgVxL9Qzbh/mDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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