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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0c74950aca3d1613c327c849f607244502dfa1952026567c405d1c9ce0b5e23' 
  AND token = 'y5bnTXjZ+ISP2RBtEWlklhtPP00eKQH335d/R3djcVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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