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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cebf2daa2a66efb3dd5869eaa61f1abdeafa5d562ed878ed51a2f0ab14a7631c' 
  AND token = 'zEcKj57mPibDRrWj04fA05qSJAj1osnGShkZkliOBpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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