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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c06b4b8e4c1098927fb49625c57eb39029b227abf31c78645a94761cbde3ae04' 
  AND token = '9WNp+Q/waFhe0ZEv03SQqpdcxgGdCEMnGFdKGrv4fCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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