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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '155d92a6b98da47a28d24f97c122b82b4e2b7b9cd50fcf473f0f27804d5d0cae' 
  AND token = 'oplIHQSVn8f/itDIhftSx7asVt03jT0r6CtAv5ZVLCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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