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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2d39fbb84e8691087c7ad9026a0155613eaf9ac089fb03b085e497d2e2e4232' 
  AND token = 'cFzJ/QSQeifrmBGWiEs5VbOrB9j2Lhhs98GoEMIrSZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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