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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1756ff3b8e4af22531309be64c1fd6d0731f7dc231ff70a2ee3ff06fd9419ce' 
  AND token = 'iMnnIm63mUFBE3+Xtgo1Ut+JDRcRymt2pCUnNviz6LA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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