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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5d1526246fb6ab0d39764053e593e341b763b7f166eb01e9327129af925cf3d' 
  AND token = 'M6IdVerkBB2odxUtpKKYRlgZTipDvm+O66Lw+lN1FP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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