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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a01fc36da16207cd41e39a3570586b01cd06ce6390216280d45b6c1632953ec' 
  AND token = 'lz1K3GqPYZKd1/6Rs9MU0Ywgd1iBH28lxd+z3aSWm/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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